Ratio calculator — solve for x and simplify ratios

Fill three of A : B = C : D to get the fourth, or just A : B to simplify it.

Fill three boxes to find the fourth, or only A and B to simplify the ratio

: = :

Fill in the form — the result appears here instantly

How it works: Ratio calculator

A ratio compares two amounts. Knowing three values of A : B = C : D, cross-multiplication gives the fourth: 2 cups of flour per 3 spoons of sugar means 9 spoons of sugar need 2 × 9 ÷ 3 = 6 cups of flour.

Leave C and D empty to simplify A : B (e.g. 1920 : 1080 = 16 : 9) and see the split as percentages.

FAQ

What ratio is 1920×1080?

16 : 9.

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